MARGARITA. 



297 



the base still smaller, or (3d) the spiral sculpture obsolete, surface 

 smooth or nearly so above and beneath. The spire is more or less 

 elevated ; apex obtuse ; suture impressed, sometimes subcanaliculate ; 

 body-whorl convex beneath ; aperture oblique, oval-rhomboidal, very 

 brilliantly iridescent within, but the acute peristome has a rather 

 broad marginal band of opaque white; columella simple; umbilicus 

 tubular, with incremental stria? within. Alt. 4-5, diam. 4-5 mill. 



Sitka to San Diego, CaL 



M. lirulata CARP, (and vars. subelevata, obsoleta and conicct) Proc. 

 A. N. S. Phil. 1865, p. 61 ; Suppl. Rep. Brit. Asso. 1864, p. 653. 

 M. var. tenuisculpta CARP. Proc. A. N. S. Phil. 1865, p. 61. M. 

 acuticostata CARP. Proc. Cal. Acad. 1864, iii, p. 157. Gibbula 

 optabilis CPR. Proc. Cal. Acad. iii, p. 214. Gibbula parcipicta CPR., 

 Ann. and Mag. X. H. 1864, p. 426. -. sucdncta, G. funiculata 

 and G. lacunata CARP., I. c., p. 426, 427. M. lirulata (Carp.) DALL, 

 Amer. Journ. Conch, vii, p. 128. 



" After a careful study of the types of the above species, and a 

 comparison of hundreds of specimens collected by Mr. Stearns and 

 myself at Monterey and elsewhere, I am compelled to the belief that 

 they are simply forms of one protean species. They are not even 

 varieties capable of diagnosis ; for not only are the intermediate 

 specimens as abundant as the nominal species, but the characters, 

 singly, are interchanged without limitation." (Dal!.) 



The above synonymy is adopted from Dr. Dall. The species, 

 while in the highest degree variable, is easily known from other West 

 American TrochidsB. 



M. FULGIDA Jeffreys. PL 47, fig. 99. 



Shell globose-conical, rather thin, transparent, and of a bright 

 luster; sculpture, only some very fine and scratch-like spiral stride 

 round the base; color clear white; spire raised; whorls 4, convex, 

 somewhat flattened below the sutufe ; the last occupies four-fifths of 

 the shell ; apex depressed and regularly spiral ; suture rather deep ; 

 mouth circular, incurved above ; the peristome is not continuous or 

 complete, but similar to that of other species in the present genus ; 

 umbilicus narrow- and deep ; operculum filmy, multispiral, with ob- 

 scure lines to distinguish the whorls. 



Alt. -1, diam. .085 in. (Jeffreys.) 



N. Atlantic, lat. 48 6', long. W. 9 8'. 539 fms. 



T.fulgidus JEFFR. P. Z. S. 1883, p. 95, t. 20, f. 1. 



